I've definitely determined that the water is NOT coming from the exterior of the car, but from the AC. And this time the water was also on the front passenger floor. A cursory inspection shows a clear plastic hose coming out from under the glove box and disappearing in the nether regions behind the interior trim. It also appears to be full of a clear fluid.
So I guess that has to be my AC drain, right? I mean, what bonehead car company runs that through the passenger compartment? Anyway, I may just be blind but I can't see where that hose comes out under the car. I should be able to clear it out myself with a stick or a pen or, in the extreme case, with an air compressor, but I can't find the outlet.